...

const API = {
  hit(character, target) {
    //  create a 'punch' or 'kick' and its impact,
    //  based on character's attribute
    const attack = new CharacterAttack(character)

    const damage = character.createDamage(attack, target)
    ...
  }

  castSpell(character, magic, target) {
    const attack = MagicRepo.find(magic)

    const damage = character.createDamage(attack, target)
    ...
  }

  attack(character, target) {
    const { attack } = character.getWeapon()

    const damage = character.createDamage(attack, target)
    ...
  }

  ...
}

export default API